Shiva electronics offer photoelectric sensors for hopper level control applications. These sensors use invisible infrared light beam to determine the distance to the top level. These photoelectric sensors can be very reliably used to maintain sufficient material in the hopper by controlling the inlet valve. The sensors are available in m36 brass chrome plated housing and work on 12 v dc or 24 v dc supply. Sensing range is between 100 mm and 600 mm. The photoelectric sensors are designed very user-friendly by providing a teach button and red led for selection of lower level and upper level. A green led is provided for output on/off indication. Npn or pnp transistor output is available to drive inlet valve and is protected for short-circuit, overload and inductive load. The speciality of these sensors is that their functioning is independent of object colour. If the levels are set on white object and use for red, black, blue or any colour object, one gets the same level control. Except for water-clear materials the sensors work fine for all other colour material. The photoelectric sensors are very useful for tube filling machines, pharmaceutical, food, packaging and plastic industries.
